60 THE PALEONTOLOGY OF MINNESOTA. 
(Synopsis of Receptaculites. 
R. CALCIFERUS Billings. 
1865. Receptaculites calciferus BiLLINGSs. Paleozoic Fossils, vol. i, p. 359, fig. 346; p. 384, fig. 358. 
1865. -Receptaculites calciferus BILLINGS. Canadian Naturalist and Geologist, sec. ser. vol. ii, p. 190, fig. 6. 
1884. Receptaculites calciferus HINDE. Quart. Jour. Geol. Soc. London, vol. xl, p. 845. 
This is the oldest known species of the genus. 
Formation and locality.—Calciferous formation ; Mingan islands, Lower St. Lawrence. 
R. MAMMILLARIS Walcott. 
1884. Receptaculites mammillaris WALCOTT. Monograph U.S. Geological Survey, vol. viii, p. 65, pl. 
ie fies tle e 
This species is smaller than RA. occidentalis Salter, and has the outer margin elevated, producing a 
broad, deep depression in the upper portion. 
Formation and locality.—Upper part of the Pogonip group=Chazy group of New York ; Eureka and White Pine districts, 
Nevada. 
R. ELONGATUS Walcott. 
1884. Receptaculites elongatus WALCOTT. Monograph U.S. Geological Survey, vol. viii, p. 66. 
A cylindro-conical species, with a very deep depression on the upper side. The largest head-plates 
of the spicules are 1 mm. in width by five-sixths of 1 mm. in length. 
Formation and locality.x—Upper part of the Pogonip group=Chazy group of New York; Eureka district, and in the 
Pahranagat range, Nevada. 
R. ELLIPTICUS Walcott. 
1884. Receptaculites ellipticus WALCOTT. Monograph U. S. Geological Survey, vol. viii, p. 67, pl. 11, 
fig. 12. 
Seems to differ from R. elongatus in having larger spicular head-plates. The curved form and ellip- 
tical transverse section may be due to accidental causes. 
Formation and locality.—Upper part of the Pogonip group=Chazy group of New York ; Eureka district, Nevada. 
R. OCCIDENTALIS Salter. 
21847. Receptaculites neptuni HALL’ (non Defrance), Paleontology of New York, vol. i, p. 68, pl. 24, 
figs. 3a-8d. 
21855. Receptaculites neptuni EMMons. American Geology, pt. ii, p. 230, pl. 14, fig. 1. 
1859. Receptaculites occidentalis SALTER. Canadian Organic Remains, dec. i, p. 45, pl. 10, figs. 1-7. 
1863. Receptaculites occidentalis BILLINGS. Geology of Canada, p. 937. 
1865. Jteceptaculites occidentalis BILLINGS. Paleozoic Fossils, vol. i, p. 381, figs. 354-356. 
1865. Receptaculites occidentalis BrLLINGs. Canadian Naturalist and Geologist, sec. ser., vol. ii, p. 
187, figs. 2-4. 
1884. Receptaculites occidentalis HINDE. Quar. Jour. Geol. Soc. London, vol. xl, p. 842, pl. 37, figs. 
3a-3m., 
Very similar to R. oweni, but it differs in having a greater number of canals in the plates of 
the upper or inner surface; also in the head-plates of the outer or under surface having prominent central 
knobs. 
Formation and locality.—Trenton limestone; Pauquette Rapids, Ottawa river, Canada; two miles south of High 
Bridge, Kentucky; and ? Oarlisle, Pennsylvania. 
Rk. INFUNDIBULIFORMIS Haton, sp. 
1832. Coscinopora infundibuliformis HATON. Geological Text Book. 
1863. Receptaculites infundibuliformis HALL. Sixteenth Rep. N. Y. State Cab. Nat. Hist., p. 67. 
1883. Receptaculites infundibuliformis HALL. Second Ann. Rep. N. Y. State Geologist, pl. 28, fig. 10. 
21883. Receptaculites monticulatus HALL. Ibidem, pl. 23, figs. 3-9, 11. 
1887. Receptaculites infundibuliformis HALL. Paleontology of New York, vol. vi, p. 290, pl. 24, 
figs. 3-11. 
A large disk-shaped species much like R. occidentalis. The specimens to which the name &. monti- 
culalus has been given are now regarded by Prof. Hall as the young of this species and should be 
compared with Cerionites dactylioides Owen, sp.,* of the Niagara group. 
Formation and Locatlity.—Lower Helderberg group: Helderberg Mts., New York. 
*Geol. Surv. Illinois, vol. iii, p, 345, pl. 5, figs. 2a-20; 1868. 
